Casing for an air conditioning unit



FIG. 1 is a front isometric view of a casing for an conditioning unit;

FIG. 2 is an isometric view favoring the rear;

FIG. 3 is a rear elevational view;

FIG. 4 is a front elevational view; and,

FIG. 5 is a right side elevational view, wherein the left side elevation side elevation view is a mirror image thereof. 

CLAIM The ornamental design for a casing for an air conditioning unit, as shown. 